2011/5/17 Abhay B. Chaware <Abhay.Chaware@kpitcummins.com>

Hi

I have few questions about Drools.

Are rules compiled, partially compiled or interpreted ?

Rules are indeed compiled, but any system where the order of execution
is so highly dynamic has to do some operation in an interpretative mode.

When I call fireAllRules(), does it ( or can it ) create a new thread that runs parallely or the operation is sequential and the caller program HAS TO wait till all rules execution is done ?

No special thread is created. fireAllRules() returns when no more rule activations are to be "fired".

Also, How is the application data integrity guarantied? E.g. what happens when some of the facts are changed in middle of rules being executed .. ? what should happen ?

When a rule activation is executed, the code of the consequence frequently changes one or more facts. This results in reevaluations of rule conditions, etc. This is just the way Drools works.

-W

-abhay

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